42=-3(-5-4a)-5(-8a-1)

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Solution for 42=-3(-5-4a)-5(-8a-1) equation:


Simplifying
42 = -3(-5 + -4a) + -5(-8a + -1)
42 = (-5 * -3 + -4a * -3) + -5(-8a + -1)
42 = (15 + 12a) + -5(-8a + -1)

Reorder the terms:
42 = 15 + 12a + -5(-1 + -8a)
42 = 15 + 12a + (-1 * -5 + -8a * -5)
42 = 15 + 12a + (5 + 40a)

Reorder the terms:
42 = 15 + 5 + 12a + 40a

Combine like terms: 15 + 5 = 20
42 = 20 + 12a + 40a

Combine like terms: 12a + 40a = 52a
42 = 20 + 52a

Solving
42 = 20 + 52a

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '-52a' to each side of the equation.
42 + -52a = 20 + 52a + -52a

Combine like terms: 52a + -52a = 0
42 + -52a = 20 + 0
42 + -52a = 20

Add '-42' to each side of the equation.
42 + -42 + -52a = 20 + -42

Combine like terms: 42 + -42 = 0
0 + -52a = 20 + -42
-52a = 20 + -42

Combine like terms: 20 + -42 = -22
-52a = -22

Divide each side by '-52'.
a = 0.4230769231

Simplifying
a = 0.4230769231

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